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Finding Report of weighbridge error at truck out side in Middle
of
December 2012
Weighbridge truck out lay out:
Abnormal Observation:
1. The weight indication out of tolerant.
2. The weight indication not same at four corner and center
3. The indicator sometime shown some value during empty and
fluctuates.
Troubleshooting step:
1. Disconnect and check all load cells ohm reading. Not detect
any abnormality
2. Replace load cell summing board located under weighbridge and
adjust
balancing resistor on new summing card.
3. Check again all load cell ohm reading after get reading
during empty and
compare with initial reading.
4 1
23
Metter Toledo
Office
Load Cell location
Summing
board
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Initial Load Cell Ohm reading during weighbridge empty
Load Cell no 1 2 3 4
Input (BuBk) 4487 4446 4470 4500
Output (Rd-Wh) 4010 4008 4010 4010
Load Cell Ohm reading during weighbridge empty but the display
still shown 60kg
Load Cell no 1 2 3 4
Input (BuBk) 4487 4445 4476 4489
Output (Rd-Wh) 4010 4008 4008 4011
Defect finding
1. The resistant reading for load cell no 3 and 4 sometime not
going back to
existing reading during empty load.
New Load Cell Ohm reading ( before install )
Load Cell no 1 2 3 4
Input (BuBk) 4446 4445
Output (Rd-Wh) 4010 4010
New Load Cell Ohm reading ( after install under weighbridge
)
Load Cell no 1 2 3 4
Input (BuBk) 4447 4451
Output (Rd-Wh) 4010 4012
Corrective Action Step:
1. Replace both load cell no 3 and 4
2. Balance all four corners and center reading by using forklift
together with 1
pallet of cement as a test weight. Total weight around 6t.
3. Use few lorries with cement loaded around 40t and 70t to
check the reading.
4. Make zero and span correction at Metter Toledo.
General finding and recommendations:
1. A lot of spillage under around all load cell and touch the
bridge. Most off the
elastomer bearing, located under load cell was covered by
spillage. Has to do
regular cleaning to avoid of rusty and damage the elastomer
bearing.
2. The entire weighbridge pit floor filled with water and
spillage. Water stagnant
and cannot flow to sump pump pit due to block by spillage. Has
to do regular
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cleaning. Suggest to raise up the floor about 3 inch high and 3
feed width
along the bridge centre line.
3. Sump pump panel box rusty. Has to replace with new. Suggest
to relocate
above ground floor.
4. The sump pump pit cover is too heavy and difficult to open
for pump
inspection. The cover only can be open with two strong men.
Suggest to
replace with thinner plate, split to two pieces, fix with door
hinge and handle.
5. The pit area is dark. Recommend to install permanent
lighting. Only switch on
when require.
New load cell Summing board.
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Condition under bridge. Sludge
Under Bridge condition. Water stagnant
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Under bridge. Sludge
Spillage at load cell area. Covered half of the elastomer
bearing and slightly touch thebridge.
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Load Cell and Elastomer bearing. Condition in April 2009
Sump pump pit cover. To change the cover with new design. To
relocate the pump
panel to outside the pit.
